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L111 Exam III, FRIDAY, November 4, Fall Semester of 2005
L111 Exam III, FRIDAY, November 4, Fall Semester of 2005

... c. Mutation increases the frequency of rare alleles while random genetic drift always reduces the frequency of rare alleles, causing them to be lost from a population. d. Mutation makes populations genetically more similar while random genetic drift makes them genetically more different from one ano ...
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... • When there was a shortage of food, this cichlid could survive on different food that then other cichlids because it could go deeper in the lake • It survived, reproduced, and passed on its traits to its offspring. • Over time, there were 2 types of cichlids. One spent most time in deeper levels. • ...
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BIO101 Objectives Unit 2 1 Chapter 14 1. Describe the work of
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Ch 23
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CHAPTER 23

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Gene flow and reproductive isolating barriers (1)
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< 1 ... 1850 1851 1852 1853 1854 1855 1856 1857 1858 ... 1937 >

Microevolution

Microevolution is the change in allele frequencies that occur over time within a population. This change is due to four different processes: mutation, selection (natural and artificial), gene flow, and genetic drift. This change happens over a relatively short (in evolutionary terms) amount of time compared to the changes termed 'macroevolution' which is where greater differences in the population occur.Population genetics is the branch of biology that provides the mathematical structure for the study of the process of microevolution. Ecological genetics concerns itself with observing microevolution in the wild. Typically, observable instances of evolution are examples of microevolution; for example, bacterial strains that have antibiotic resistance.Microevolution over time leads to speciation or the appearance of novel structure, sometimes classified as macroevolution. Macro and microevolution describe fundamentally identical processes on different scales.
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